/*
 * Copyright 2011-2013 Blender Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

CCL_NAMESPACE_BEGIN

/* Geometry Node */

ccl_device_inline void svm_node_geometry(
    KernelGlobals *kg, ShaderData *sd, float *stack, uint type, uint out_offset)
{
  float3 data;

  switch (type) {
    case NODE_GEOM_P:
      data = sd->P;
      break;
    case NODE_GEOM_N:
      data = sd->N;
      break;
#ifdef __DPDU__
    case NODE_GEOM_T:
      data = primitive_tangent(kg, sd);
      break;
#endif
    case NODE_GEOM_I:
      data = sd->I;
      break;
    case NODE_GEOM_Ng:
      data = sd->Ng;
      break;
#ifdef __UV__
    case NODE_GEOM_uv:
      data = make_float3(sd->u, sd->v, 0.0f);
      break;
#endif
    default:
      data = make_float3(0.0f, 0.0f, 0.0f);
  }

  stack_store_float3(stack, out_offset, data);
}

ccl_device void svm_node_geometry_bump_dx(
    KernelGlobals *kg, ShaderData *sd, float *stack, uint type, uint out_offset)
{
#ifdef __RAY_DIFFERENTIALS__
  float3 data;

  switch (type) {
    case NODE_GEOM_P:
      data = sd->P + sd->dP.dx;
      break;
    case NODE_GEOM_uv:
      data = make_float3(sd->u + sd->du.dx, sd->v + sd->dv.dx, 0.0f);
      break;
    default:
      svm_node_geometry(kg, sd, stack, type, out_offset);
      return;
  }

  stack_store_float3(stack, out_offset, data);
#else
  svm_node_geometry(kg, sd, stack, type, out_offset);
#endif
}

ccl_device void svm_node_geometry_bump_dy(
    KernelGlobals *kg, ShaderData *sd, float *stack, uint type, uint out_offset)
{
#ifdef __RAY_DIFFERENTIALS__
  float3 data;

  switch (type) {
    case NODE_GEOM_P:
      data = sd->P + sd->dP.dy;
      break;
    case NODE_GEOM_uv:
      data = make_float3(sd->u + sd->du.dy, sd->v + sd->dv.dy, 0.0f);
      break;
    default:
      svm_node_geometry(kg, sd, stack, type, out_offset);
      return;
  }

  stack_store_float3(stack, out_offset, data);
#else
  svm_node_geometry(kg, sd, stack, type, out_offset);
#endif
}

/* Object Info */

ccl_device void svm_node_object_info(
    KernelGlobals *kg, ShaderData *sd, float *stack, uint type, uint out_offset)
{
  float data;

  switch (type) {
    case NODE_INFO_OB_LOCATION: {
      stack_store_float3(stack, out_offset, object_location(kg, sd));
      return;
    }
    case NODE_INFO_OB_COLOR: {
      stack_store_float3(stack, out_offset, object_color(kg, sd->object));
      return;
    }
    case NODE_INFO_OB_INDEX:
      data = object_pass_id(kg, sd->object);
      break;
    case NODE_INFO_MAT_INDEX:
      data = shader_pass_id(kg, sd);
      break;
    case NODE_INFO_OB_RANDOM: {
      if (sd->lamp != LAMP_NONE) {
        data = lamp_random_number(kg, sd->lamp);
      }
      else {
        data = object_random_number(kg, sd->object);
      }
      break;
    }
    default:
      data = 0.0f;
      break;
  }

  stack_store_float(stack, out_offset, data);
}

/* Particle Info */

ccl_device void svm_node_particle_info(
    KernelGlobals *kg, ShaderData *sd, float *stack, uint type, uint out_offset)
{
  switch (type) {
    case NODE_INFO_PAR_INDEX: {
      int particle_id = object_particle_id(kg, sd->object);
      stack_store_float(stack, out_offset, particle_index(kg, particle_id));
      break;
    }
    case NODE_INFO_PAR_RANDOM: {
      int particle_id = object_particle_id(kg, sd->object);
      float random = hash_uint2_to_float(particle_index(kg, particle_id), 0);
      stack_store_float(stack, out_offset, random);
      break;
    }
    case NODE_INFO_PAR_AGE: {
      int particle_id = object_particle_id(kg, sd->object);
      stack_store_float(stack, out_offset, particle_age(kg, particle_id));
      break;
    }
    case NODE_INFO_PAR_LIFETIME: {
      int particle_id = object_particle_id(kg, sd->object);
      stack_store_float(stack, out_offset, particle_lifetime(kg, particle_id));
      break;
    }
    case NODE_INFO_PAR_LOCATION: {
      int particle_id = object_particle_id(kg, sd->object);
      stack_store_float3(stack, out_offset, particle_location(kg, particle_id));
      break;
    }
#if 0 /* XXX float4 currently not supported in SVM stack */
    case NODE_INFO_PAR_ROTATION: {
      int particle_id = object_particle_id(kg, sd->object);
      stack_store_float4(stack, out_offset, particle_rotation(kg, particle_id));
      break;
    }
#endif
    case NODE_INFO_PAR_SIZE: {
      int particle_id = object_particle_id(kg, sd->object);
      stack_store_float(stack, out_offset, particle_size(kg, particle_id));
      break;
    }
    case NODE_INFO_PAR_VELOCITY: {
      int particle_id = object_particle_id(kg, sd->object);
      stack_store_float3(stack, out_offset, particle_velocity(kg, particle_id));
      break;
    }
    case NODE_INFO_PAR_ANGULAR_VELOCITY: {
      int particle_id = object_particle_id(kg, sd->object);
      stack_store_float3(stack, out_offset, particle_angular_velocity(kg, particle_id));
      break;
    }
  }
}

#ifdef __HAIR__

/* Hair Info */

ccl_device void svm_node_hair_info(
    KernelGlobals *kg, ShaderData *sd, float *stack, uint type, uint out_offset)
{
  float data;
  float3 data3;

  switch (type) {
    case NODE_INFO_CURVE_IS_STRAND: {
      data = (sd->type & PRIMITIVE_ALL_CURVE) != 0;
      stack_store_float(stack, out_offset, data);
      break;
    }
    case NODE_INFO_CURVE_INTERCEPT:
      break; /* handled as attribute */
    case NODE_INFO_CURVE_RANDOM:
      break; /* handled as attribute */
    case NODE_INFO_CURVE_THICKNESS: {
      data = curve_thickness(kg, sd);
      stack_store_float(stack, out_offset, data);
      break;
    }
    /*case NODE_INFO_CURVE_FADE: {
      data = sd->curve_transparency;
      stack_store_float(stack, out_offset, data);
      break;
    }*/
    case NODE_INFO_CURVE_TANGENT_NORMAL: {
      data3 = curve_tangent_normal(kg, sd);
      stack_store_float3(stack, out_offset, data3);
      break;
    }
  }
}
#endif

CCL_NAMESPACE_END
